Adage Capital Management, L.P. - Sep 26, 2025 SCHEDULE 13D Report for 89bio, Inc. Common Stock, par value $0.001 per share (ETNB)

Filing Manager
Adage Capital Management, L.P.
Reporting Manager
Adage Capital Management, L.P.
Security
89bio, Inc. Common Stock, par value $0.001 per share
Symbol
ETNB
Shares outstanding
148M shares
Disclosed Ownership
9.1M shares
Ownership
6.13%
Form type
SCHEDULE 13D
Date filed
10/3/2025, 04:01 PM
Date of event
Sep 26, 2025
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Adage Capital Management, L.P. 6.13% 9.1M 0 9.1M /s/ Robert Atchinson By: Adage Capital Partners LLC, its General Partner, By: Robert Atchinson, its Managing Member 0001535978
Robert Atchinson 6.13% 9.1M 0 9.1M /s/ Robert Atchinson Robert Atchinson, Individually 0001403404
Phillip Gross 6.13% 9.1M 0 9.1M /s/ Phillip Gross Phillip Gross, Individually 0001403413